Loom temple with thread cutting mechanism



Nov. 28, 1933. F, D GLAS 1,937.08]

LOOM TEMPLE WITH THREAD CUTTING MECHANISM Filed May 8, 1933 2 Sheets-Sheet 1 W/T/VE 53. INVENTOR.

CL l/YTON J? COBUEN. fiefafi/ f. 00061 A5 ATTORNEY.

Patented Nov. 28, 1933 UNI D STATES LooM TEMPLE WITH THREAD CUTTING MECHANISM Fredric E Douglas, Hopedale, Mass, assignor to Draper Corporation, Hopedale, Mass, a cor- I poration of Maine Application May 8, 1933. Serial No. 669,881

' 8 Claims.

The present invention relates to thread cutting mechanism for loom temples and has more particular reference to such mechanisms having a moving thread cutting blade which is rendered 5 inoperative after it has operated a predetermined number of times.

Thread cutting mechanisms of the type mentioned are usually connected with the filling replenishing mechanism of an automatic fillingreplenishing loom, so as to be put into operation immediately after each replenishment of the filling supply, which is usually. the only time threads to be out are presented to the thread cutting mechanism. Existing devices for rendering the thread cutting blade inoperative after it has operated the required number of times are, in general, too'complicated to be of material practical value, or are not sufficiently positive in operation and consequently rendered unreliable by the shock and jar incident to operation of the loom.

Accordingly, it is the principal object of my invention to provide a loom temple carrying a thread cutting mechanism which includes a movable cutting blade and a simple, reliable means acting positively to render the cutting blade inoperative after a predetermined number of operations thereof.

The mechanism which I have devised for the foregoing purpose includes a toothed ratchet element and a pair of toothed pawl elements cooperating in a novel manner, to positively produce relative movement therebetween which positive movement is utilized to effect the locking of the thread cutting blade out of operation. In the preferredform, the elements are positioned substantially in a single plane parallel to and closely adjacent the plane of the thread cutting blade,

whereby the entire mechanism is extremely comand Fig. 4 is a view similar to Fig. 3 but showing 7 the parts in the'positions they occupy whenthe thread cutting blade is lockedout' of operation.

The templeftc'which my inventionhas been those shown, the principal requisite, so far as my after described.

applied is of conventional design except where modified to cooperate with the novel formiof thread cutting mechanism. Such temple! includes a bar 1, adapted to be received in the con- I ventional housing mounted on the-breast beam of the loom (not shown). The bar 1' carries at its rearward end a head comprised f a cap 2 and a base 3 held together by means including a screw S. A temple roll or rolls (not shown) may be housed in the temple head, and the base 3, which,

a vertical plane and extends through the temple head from front to rear thereof. 15

The ledger blade 5 shown bears against one Ver tical wall of the/guideway and is of the form shown in my copending'application Serial No. 625,763, filed July'29, 1932, now Patent Number 1,914,663, granted June 20, 1933.. The blade 680 V will be recognized as being of conventional form, the same being confined-to rocking and sliding movements in the guideway '7 and being constituted by a casting on the rear" end of which is formed a cutting'ti p Band on the forward end 8 5 'of which is formed adepending heel 9 carrying a stud 10". A coil spring 11 has a depending arm (not shown) for engagement with the stud 10 in the usual manner, for urging the blade .6 rearwardlyto the position shown in Fig. 3, the blade beinggiven its forward cutting stroke by the;usual lay'bu'nteru I It is noted at this time that other conventional threadcutting devices -may be substituted for invention is concerned, being that such devices include a movable thread cuttingbla'de which in its operation is confined to movement substantially in a vertical plane.

The cap 2 has been extended forwardly and lupwardly at one 'side'of'the bar 1 to form a housing 12 within which is formed a substantially" vertical guideway 13. Acover plate 14 may be securedto the vertical face of the cap and housing, .to cover-and conceal certainfparts herein- A locking member is, constituted in the present instance by a flatbar having a flanged edge 16, is positioned vertica'llyin the guideway 13' and is vertically. slidable therein. The uppermost '50 j w The oscillating pawl .28 consists .of' a hat bar the position in which it appears in Fig, 3, while its lowermost position shown in Fig. 4, is a lockingposition. In the locking position of the mom-- ber 15 the inclined edge 17 thereof engages the stud and locks the thread cutting blade 6 in its frontwardposition against the action of spring 11, thus rendering the blade inoperative.

jThe locking member may be raised to its uppermost position by any suitablemeans such as a lever 18 pivoted on a screw 19 and engaging a pin20 in the top of member 15 The lever 18 is'operable at the desired time by'connections-to the replenishing mechanism (not shown) or any suitable part thereof, such connections being not illustrated 01' described as they form no part of r the present invention and, in addition, arewell the locking member and one is regularly oscillated. It willbe apparent that, from oneview point, it makes little difierence which of the three elements is connected to the locking member or which is the fixed element, but I have illustrated and will now describe'the specific embodiment which I consider the most desirable.

In such embodiment theratchet element 21 is constituted by a vertically extending toothed rack;

vlded with a forwardly extending tooth 26 adapted to successively contact the teeth of the rack,

having a toothed surface; 22. and is movably mounted on' the locking member 15, as by being pivotally suspended from a screw 23 in the mem- 'ber, 15. Thus, the rack is positioned, and operates-ma. plane parallel to the plane. ofthe "thread cutting blade 5. A spring 24, having its upper end fixed in the rack and its lower free end bearing againstthe flange 16, constitutes means'for yieldingly urging the rack rearwardly toward the The pawl 25 consists of a fiat'metal plate proin a manner hereinafter described. The pawl 25 'is positioned in the plane of raclrzl, being fixed to the face of the cap 2 by a screw 27.

carrying a tooth 29, the point of which is spaced, lengthwise of the rack, from the point of tooth 26. The'bar is'pivotally suspended from a pin 30 in bracket 31 which is fixed to the upper forward portion of housing 12 as by ascrew 32. The lower end of the pawl 28 is provided with aslot 33 engaging'over the stud 10 on the thread cutter heel 9, whereby the pawl -iskoscillated-in synchronism with the movements. of the thread cut- .ting blade 6. The tooth 29 and the tooth 26 are comparatively thin and, while they overlap slight- 1y, they are nevertheless both substantially in the, I same plane as therack 2-1.-

' teeth 29,26 as spaced vertically along therack a distance equal to about half the pitch distance of the rack teeth, they may be otherwise spaced,

It will be noted that while I have shown. the

as even specific expressions of .my invention require only that this spacing bewother than an even multiple of the pitchfdistance; of the rack teeth. This may be more readily understood after a detailed study of the operation of the mechanism, which is as follows: 7

When .the locking member is raised to its upperand thereby the pawl 28, are then returned rearloclting member results in edge 17 thereof engag- "the cutting blade Fig. 4.

position of the latter. 1

position of the member 15 is substantially above most position, which is some distance above that shown in Fig. 3', the thread cutting blade 6 is put in operation. As the blade 6 is moved forwardly (to the left in Figs. 3 and 4) the tooth 29 will be moved horizontally into contact with one of the rack teeth 22 and will swing the rack for-'- wardly'against the'action of spring 24 until the rack teeth are clear of the fixed pawl-25, 26. Then, since the lower inclined surface of tooth 29 only partially overlaps the upper inclined surface of the contacting rack tooth, continued forward I novement of the tooth 29'will serve to camth-e rack downward a distance equal to about half the thickness of the rack tooth. The blade 6,

wardly, whereupon spring 24 will urge the rack: rearwardly and the lower inclined surface of the fixed tooth 26 will engage the upper inclined sur-s face of the next rack tooth and, under the in fiuence of the spring 24, will be cammed downwardly a further half-tooth distance.

The alternate, horizontal. engagement. of the pawls with therack is continuedso long as the thread cutting blade remains in operation and each time the blade makes one complete stroke the rack, and thereby the locking member, will 7 be positively forced downwardly towardthelocking position'ot the latter.- It will be noted that the upper surface otthe top rack tooth is somewhat longerthan'the othersand the final locking movement of the rack and locking member will be greater than the normal step by step movement thereof, but this is but a matter of expediency. However, the final movement of the ing stud 10 and looking all the parts, including 6, in the position shown in Having fully disclosed the-preferredembodi ment of my invention, I claim: 7

11' The combination "of'a loom temple-with a thread cutting mechanism carried thereby, Said thread cutting mechanism including a thread cutting blade operating ina vertical plane, a look-- ing member operating in a plane parallel to the plane of said thread cutting bade and movable to and from looking position wherein it looks thesaid blade out of operation, a toothed ratchet element Sand apair of toothed pawl elements, which elements are positioned substantially in a-single plane parallel tothe plane of said thread'cutting blade and of which elements one is fixed and one "is connected to said locking member, and means for relatively moving said elementstransversely of the direction of movement 01 said member'to 3 positivelymove the latter step by step to'locking position; I j v p 2. The combination of aloom temple with a thread cutting mechanism carriedthereby, said thread cutting mechanism including a thread cut- 35 I tially parallel thereto,'a fixed pawl and a movable pawl spaced along said rack, and means for alter- V nately engaging said pawls horizontally with the teeth-of said rack for positivelymoving the rack V and thereby the locking member, toward locking 3-. The combination of a loom temple with a thread cutting mechanism carried thereby, said I thr ad cutting mechanism including a thread cut-l 5 ting blade operating in a vertical plane, a locking member operating in a plane parallel to the plane of said thread cutting blade and movable vertically to and from locking position wherein it renders the said blade inoperative, a toothed rack movably mounted onsaid member and extending substantially parallel thereto, a fixed pawl and a movable pawl spaced along said rack a distance other than an even multiple of the pitch distance of the rack teeth, and means for alternately engaging said pawls horizontally with the teeth of said rack for positively moving the rack and thereby the locking member, toward locking position of the latter.

4. The combination of a loom temple with a thread cutting mechanism carried thereby, said thread cutting mechanism including a thread cutting blade operating in a vertical plane, a looking member operating in a plane parallel to the,

plane of said thread cutting blade and movable vertically to and from looking position wherein it renders the said blade inoperative, a toothed rack pivotally mounted on said member and extending substantially parallel thereto, a fixed pawl and a movable pawl spaced along said rack a distance less than the pitch distance of the rack teeth, and

means for alternately engaging said pawls horizontally with the teeth of said rack for positively moving the rack and thereby the locking member, toward locking position of the latter.

5. The combination of a loom temple with a thread cutting mechanism carried thereby, said 7 thread cutting mechanism including a thread cutting blade operating in a vertical plane, a substantially vertically extending locking member positioned by the side of said thread cutting blade and movable vertically to and from looking position wherein it locks the said blade out of operation, a toothed rack supported by said member, a fixed pawl and. a movable pawl for positively moving said rack and thereby the locking member toward locking position of the latter, and means for oscillating said movable pawl in synchronism with the movements of the said thread cutting blade.

6. The combination of a loom temple with a thread cutting mechanism carried thereby, said thread cutting mechanism including a thread cutting blade operating in a vertical plane, a substantially vertically extending locking member positioned by the side of said thread cutting blade and movable vertically to and from looking position wherein it locks the said blade out of opera-' tion, a toothed rack movably mounted on said member, a fixed pawl and a movable pawl positioned substantially in the plane of said rack and spaced therealong, and means for successively engaging the said pawls with the teeth of the said rack to positively move the rack, and thereby the locking member, toward locking position of the latter.

7. The combination of a loom temple with a wherein it looks the said blade out of operation,

a toothed rack pivoted to said memberand having a vertically extending toothed surface, a fixed pawl and a movable pawl positioned substantially in the plane of said rack and spaced there along a distance other than in even'multiple of the pitch distance of the rack teeth, means for yieldingly urging said rack toward the said fixed pawl, and means .for oscillating said movable pawlhorizontally into and out of, contact with the rack teeth to thereby positively move the rack andthe locking member toward locking position.

8. The combination of a loom temple with a thread cutting mechanism carried thereby, said thread cutting mechanism including afthread cutting blade operating in a vertical plane, a locking member positioned adjacent said thread cutting blade and movable to and from locking position wherein it engagessaidvblade and locks the latter out of operation, a toothed rack having connections to said member, a fixed pawl and a movable pawl spaced along said rack a distance other than an even multiple of the pitch distance of the rack teeth, and means for alternately engaging said pawls with the teeth of the rack in.

a direction at right angles to the length of the rack, such engagement serving 1 to cam the rack lengthwise in a direction to move said member toward-locking position.

"FREDRIC E. DOUGLAS. 1 

